1 Lyncis

1 Lyncis
Observation data
Epoch J2000      Equinox J2000
Constellation Lynx
Right ascension 06h 17m 54.81907s[1]
Declination +61° 30 55.0251[1]
Apparent magnitude (V) 4.95[2]
Characteristics
Spectral type M3IIIab[3]
U−B color index +1.96[2]
B−V color index +1.83[2]
Variable type Semiregular variable
Astrometry
Radial velocity (Rv)11.56±0.44[4] km/s
Proper motion (μ) RA: –10.59 ± 0.36[1] mas/yr
Dec.: -3.11 ± 0.29[1] mas/yr
Parallax (π)5.11 ± 0.33[1] mas
Distance640 ± 40 ly
(200 ± 10 pc)
Details
Luminosity2,848[5] L
Temperature3,485[5] K
Other designations
1 Lyncis, BD +61 869, FK5 2479, HD 42973, HR 2215, HIP 29919, SAO 13787.[6]

1 Lyncis, also known by its variable star designation of UW Lyncis, is a star in the constellation Lynx. It is a red giant of spectral type M3III. It has been classified as a slow irregular variable,[7] after being found to be slightly variable in 1969 by Olin J. Eggen.[8] Its changes in brightness are complex, with two shorter changeable periods of 35–40 and 47–50 days due to the star's pulsations, and a longer period of 1500 days possibly due to the star's rotation or convectively induced oscillatory thermal (COT) mode.[9]

References

  1. 1 2 3 4 5 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  2. 1 2 3 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV data. SIMBAD. Bibcode:1986EgUBV........0M.
  3. Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society 389 (2): 869. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x.
  4. Famaey, B.; et al. (2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters". Astronomy and Astrophysics 430: 165–186. arXiv:astro-ph/0409579. Bibcode:2005A&A...430..165F. doi:10.1051/0004-6361:20041272.
  5. 1 2 McDonald, I.; et al. (2012). "Fundamental Parameters and Infrared Excesses of Hipparcos Stars". Monthly Notices of the Royal Astronomical Society 427 (1): 343–57. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x.
  6. "1 Lyncis". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 9 March 2016.
  7. Watson, Christopher (4 January 2010). "UW Lyncis". AAVSO Website. American Association of Variable Star Observers. Retrieved 10 March 2016.
  8. Eggen, Olin J. (1969). "Light Variations of Small Amplitude in the Red Giants of the Disc Population". Information Bulletin on Variable Stars (355, #1. (IBVS Homepage)). Bibcode:1969IBVS..355....1E.
  9. Percy, John R.; Wilson, Joseph B.; Henry, Gregory W. (2001). "Long-Term VRI Photometry of Small-Amplitude Red Variables. I. Light Curves and Periods". The Publications of the Astronomical Society of the Pacific 113 (786): 983–96. Bibcode:2001PASP..113..983P. doi:10.1086/322153.
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